I made a bunch of adjustment layers and layer masks. I made an unknown amount of passes.

This process is practically just adding filters and then adjusting the saturation of the image. I used one pass.

The PNG file wouldn't load. Switched it to JPEG.

Final:

First I cut natalie portman out of the original picture and then used the refine edge tool to get a more precise outline. I moved her to a new document with a solid color background then I added a subtle forest in the background by changing the opacity and the blending mode. Then I added some geometric shapes and made them very opaque. Next I added the northern lights and made them opaque and changed the blending mode. Then I used the brush tool to add the leaves and blurred them width the blur filter. Then I changed all the levels and stuff like the tutorial said, which I think made it look weird.